Insight on the generation of reactive oxygen species in the CaO2/Fe(II) Fenton system and the hydroxyl radical advancing strategy

The results showed the influences of CaO2, Fe(II), and solution pH on HO● and O2●- generation, and the HO● generation efficiency was reported for the first time

Yunfei Xue; Qian Sui; Mark L. Brusseau; Xiang Zhang; Zhaofu Qiu; Shuguang Lyu


Scholarcy highlights

  • Due to the instability of liquid H2O2 in the subsurface, the use of the conventional Fenton reaction for in situ remediation applications is limited
  • Due to the various sinks, a high concentration of probe is required in this study, and the reaction between HO● and the probe compound should be dominant, ensuring the reaction mirrors HO● generation
  • The results suggest that an acidic environment is more favorable to HO● generation in the CaO2/Fe(II) system, and this trend is consistent with the general observation in Fenton reactions in which the optimum solution pH value for Fenton oxidation process is approximately 3
  • Based on Eq 3, nitroblue tetrazolium was used to capture O2●- produced in the CaO2 based system, and the preliminary study confirmed O2●- was produced in the CaO2/Fe(II) Fenton system
  • benzoic acid and NBT were applied as probe compounds to capture the generated HO● and O2●, respectively
  • For CaO2 based Fenton system, O2●- can be produced through various reactions initiated by Fe(II) and H2O2 forming Fenton pathway, and can be directly generated when CaO2 reacts with water developing a non-Fenton pathway
  • The sequential dosing of Fe(II) can be an efficient strategy to generate higher HO● in the CaO2/Fe(II) system, showing a potential application of this technique for groundwater remediation

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